2 edition of Effect of included media on thermal conductance of contact joints found in the catalog.
|Contributions||Naval Postgraduate School (U.S.)|
|The Physical Object|
|Pagination||1 v, :|
A fundamental problem in analyzing and predicting junction thermal conductance is determining thermal contact conductance of nonflat rough metals. Workable models have been previously derived for the limiting idealized cases of flat, rough, and spherical smooth by: An integrated experimental and numerical investigation of the thermal contact resistance across two nominally flat, coated metallic engineering surfaces in contact is presented. The model consists of a surface deformation computation, which determines the actual contact area and number of contacting asperities at a joint, and a constriction resistance analysis, which determines the.
This book covers both theoretical and practical aspects of thermal contact conductance. The theoretical discussion focuses on heat transfer through spots, joints, and surfaces, as well as the role of interstitial materials (both planned and inadvertent).3/5(1). Measurements and Prediction of Thermal Contact Resistance across Coated Joints C. Merrill S V. Garimella Measurement and Prediction of Thermal Contact Resistance contact pressure and surface contamination effects on thermal contact resistance. Singhal et al.
Cylindrical Thermal Contact Conductance. (August ) George Harold Ayers, B.S., Arizona State University; M.S.,ÊArizonaÊStateÊUniversity Chair of Advisory Committee: Dr. L. S. Fletcher Thermal contact conductance is highly important in a wide variety of applications, from the cooling of electronic chips to the thermal management of spacecraft. The magnitude of the contact conductance is a function of a number of parameters including the thermophysical and mechanical properties of the materials in contact, the characteristics of the contacting surfaces, the presence of gaseous or nongaseous interstitial media, the apparent contact pressure, the mean junction temperature, and the conditions surrounding the junction, as noted by.
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The objective of this thesis is to investigate the effect of different included media on the thermal conductance of contact joints formed between two solid surfaces in simple mechanical contact. The units employed in the experimental work were designed by the author.
The types of joints investigated included bare metal-to-metal contact, contact surfaces separated by a good conductor (brass), and contact surfaces separated by a thin sheet of insulation (asbestos).Cited by: Enter the password to open this PDF file: Cancel OK.
File name:. Thermal contact resistance has been studied experimentally to investigate the effect of pressure between two aluminium or two brass rough surfaces at three different heat flux levels.
Certain surface parameters appear in the thermal contact conductance equations, which require that an analysis of the deformation of the surface under load be undertaken. This book covers both theoretical and practical aspects of thermal contact conductance. The theoretical discussion focuses on heat transfer through spots, joints, and surfaces, as well as the role of interstitial materials (both planned and inadvertent).
The work covers both theoretical and practical aspects of thermal contact conductance. The theoretical discussion focuses on heat transfer through spots, joints, and surfaces, as well as the role of interstitial materials (both planned and inadvertent). The practical discussion includes formulae.
The computed values of thermal contact conductance for an aluminium–aluminium joint are compared with the values measured in the experiments in Fig. contact pressure was kept at kPa and the measurements were done over the temperature range of 66– by: Thermal contact conductance (TCC) at material interfaces has a great impact upon the efficiency of cooling in cryogenic instruments, and is thus a crucial design parameter.
Lack of reliable numerical data for demountable in vacuum bare (uncoated, dry, and without interposers) copper-copper joints prompted us to carry out systematic studies of TCC over the temperature range 14– by: conductivity, the factors that influence the reliability of the measurement, and the techniques.
Sections covering the applications, rules for reliable measurements and frequently asked questions have been included to make this a comprehensive review of the importance of conductivity measurements. Thermal joint conductance for flexible graphite materials: analytical and experimental study IEEE Transactions on Components and Packaging Technologies, Vol.
28, No. 1 Thermal Joint Conductance of Low Density Polyethylene and Polyster Polymeric Films: ExperimentalCited by: The above conclusions suggest that future work on thermal contact conductance should Vol. 20, No.
1 THERMAL CONTACT CONDUCTANCE AND RECTIFICATION include attention to the following areas: (a) Low contact pressures of the order of 1 atmosphere (b) Effect of interstitial gases at these low contact pressures (c) Effect of the direction of heat Cited by: Thermal Contact Conductance of Adhesives for Microelectronic Systems.
Non-intrusive measurement of thermal contact conductance at polymer-metal two dimensional annular interface. Joint Conductance Effects on Estimation of Effective Thermal Cited by: Effect of pressure on thermal conductance of contact joints.
By Martin E Barzelay, Kin Nee Tong and George F Holloway. Year: OAI identifier: oai: Provided by: NASA Technical Reports Server. Download PDF. This work dealt with the problem of predicting contact, gap and joint conductances between conforming rough surfaces.
The main purpose of the work was to investigate the effect of surface micro-hardness variation upon the prediction of thermal interface conductances under the first load by: 5.
contact resistance, thermal resistance, thermal contact conductance, thermal conductivity Annotation: The thesis investigates thermal contact resistance of a. (2) Reemphasis is made of the importance of knowing the history of the contact joint. (3) A new approximate method is presented for predicting the coefficient of thermal contact conductance for rough, nominally flat, outgassed surfaces undergoing plastic de- formation in a high vacuum environment.
This new method, which does not require aFile Size: 2MB. This book covers both the theoretical and practical aspects of thermal contact conductance. The theoretical discussion covers heat transfer through spots, joints, and surfaces, as well as the role of interstitial materials (both planned and inadvertent).
Metallic Contact Conductance Contact area @ily if the actual contact area 1s of a reasonable s~.e compared with the apparent area of contact, domnant flow of heat across the mterface will certatiy be attracted through the metallic contact spots, as the thermal conduc.
Knowledge of thermal conductivity and interfacial thermal conductance and their variation with temperature are critical for the design of thermal systems.
In this paper, we review measurement techniques for characterizing thermal conductivity and interfacial thermal conductance of solid-state materials in both bulk and thin film forms.
Figure Size: 1MB. Thermoacoustics is the interaction between temperature, density and pressure variations of acoustic waves.
Thermoacoustic heat engines can readily be driven using solar energy or waste heat and they can be controlled using proportional can use heat available at low temperatures which makes it ideal for heat recovery and low power applications.THE THERMAL CONDUCTANCE OF BOLTED JOINTS A Dissertation Submitted to the Graduate Faculty of the Louisiana State University and Agricultural and Mechanical College in partial fulfillment of the requirements for the degree of Doctor of Philosophy in The Department of Mechanical, Aerospace and Industrial Engineering by John Elton Fontenot, Jr.Determining thermal contact conductance in bolted joints is a major challenge when designing for space application.
The lack of heat transfer through convection enforces the need for full understanding of thermal contact conductance, and the in uencing physical parameters. Due to the uncertain variance of pressure distribution in a bolted.